sound is heard louder at night than at day,why ?also illustration to clear your answer
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There may be less background noise at night, however another reason is because sound waves travel differently at night than during the day. There is a phenomenon called refraction that affects the direction of sound propagation. During the day, the sound bends away from the ground; during the night, it bends towards the ground. Hence at night you have additional "sound" reaching you, making it louder. This is not a perceived effect because there is less other noise around - the sound IS actually louder.
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deepakaa:
during day time particles of air are in random motion due to various sound and other factors during night time these particles are in stable state due to this sound energy transfer easily
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sound is heard louder at night then a day because at the there is a noise pollution of various vehicles but at night those vehicles are silent so we hear your voice louder then at compare to day
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